Pressure-regulating device



June 3@,, 1925. 154-3 317 L. c. BAYLEs PRES SURE REGULATING DEVICE Filed Jan. 10 1925 INVENTOR Hi6 AT ORNEY Patented June 30, 1925;

UNITED STATES;

LEWIS C. ZBAYLCES,-, OF EASTON, PENNSYLVANIA, ASSIG-NOR TO- INGERSOLL-RAND' PATENT OFFICE.

COMPANY, OF JERSEY. CITY, N'EW' J ERSE Y, A CORPORATION OF NEW JERSEY.

BREsSURE-REGULATING msvrcn Application filed January 10, 1925. Serial No. 1,714.

T all whom z't may mm.- Be it known that" I, Lnwrs 'O'. Burns, a citizen ofthevUnited States, and resident of Easton, county of Northampton, and

State of Pennsylvania,jhave invented a certain Pressure Regulating Device,rof which ..t he following is a specification, accompanied by drawings.

This invention relates to compressors, but more particularly to a device for regulating the flow of pressure fluid into a-"storage receiver, whereinit may be desirablefto con-- trol the pressure tda'zdegreemore suitable for certain requirements, as for instance, in flating automobile tires, in whichever-in.- fiation frequently occurs due to excessive pressures within the receiver. v v

It has been found that if the compressor cylinder is opened tog-atmosphere after the desired pressure has been attained in the receiver, .the compressor may be operated more economically and more efiiciently because of an additional cooling effect on the compressing element:

The principal object of this invention is to prevent the storage of compressed fluid wit n a receiver in excess of a certain predetermined pressure by controlling the' ad mission of fluid into the receiver.

Other objects will appear hereinafter. s In the drawings forming-partlof this specification, 1 Y f Figure 1 is a sectional view. i n' elevation of a compressor equipped with a pressure regulating device showing the posltionof the parts when the fluid passes into the storage receiver,

Figure 2 is aside view partly in section of a compressor equipped withIthe device showing the compressing element in communication with the atmosphere, and

Figure 3 is a transverse sectional v ew taken through Figure 2 on the line looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in a single acting compressor unit consisting of a water-cooled cylinder A having a compression cha'mberB, and a reciprocating piston C. In this instance, a fluid ti ht crank case D, having a suitable outlet serves as a storage receiver for the compressed fluid and is in communication with the compressing end of the chamber B through a suitablepassage E. Aninlet valve F in communicat on with ranged at the discharge end-o pliston C! and passes throu the atmosphere is arran ed within a watercooled cylinder head to admit air into the chamber B, while a discharge valve H controlsthe flo'w'of compressed-fluid from the chamber B through the 'passage-Eeinto the storage receiver D and ispreferablyarsaidpassage.

The piston Cis actuated by a suitable source of power, (not. shown) and'is in this instance connected therewithby a" piston rod J operatively connected to the cross headyK, and a connecting rod L, pivoted at 'one end on the cross head and pivotall connected at its other end to a crank mounted on a drive shaft P.

'Meansam provided to regulate the admission of compressedfluid into the receiver D, thus ma ntaining a constant predetermined pressuretherein. Tothis end a valve Q,

having a stem R and an enlargedhead Q,

1n communication with the pressure of the fluld within the receiver D, is'arranged-to openv a transverse port R, wherebythe pas Y sage E may be connected'with atmosphere.

The valve head Q is preferably provided with a knife-edge seat U in the form of a 'removable'bushing screw threaded into the end of the chamber $4 A'springVdisposed within the bore T is adapted to bear against the end of the valve Q-to hold said v'alvenormally in a closed position;

In. the operation of the machine, fluid is admittedby the inlet valve F into the chamber B wherein it is compressed'by the h' the passage and the discharge valve 1- into the storage receiver D, and continues to flow thereinto until the pressure within the receiver, operating against a face X of the'valve head Q, is. great enough. to overcome the force of the spring V, the'valve Q and the head Q will then be actuated within the bores S and T until a reduoed'portion "Y of the extension opens the transverse passage R, thusplacing the chamber B- and the passage E in direct communication with the atmosphere, and since the action of compression increases the temperature of the fluid thus compressed, it is obvious that the cooling effect of atmospheric air admitted into and discharged from the chamber without resistance will add. to the efficiency of the machine; v The regulating device may be adjusted to operate at diflerent pressures within the receiver by increasing or reducing the tension of the spring V. To this end a fiat cylindrical plate Z is arranged slidably in the bore T to bear against the end of the spring, and in this instance is adjusted by a set screw 1).

Assuming that a higher pressure of fluid is desired within the receiver D, the tension of thespring V may be increased by screwiriiig the set screw downwardly, thereby a ording greater resistance against the action of the compressed fluid within the receiver, and consequently requiring a higher ressure. to raise the valve Q against the orce of the spring.

In order to insure ositive seating of the valve head Q, when the pressure within the receiver D is sufficiently reduced to again permit said head to approach the seat U, a passage 0 is formed within the wall of the 'bore S, and is of suitable length to communicate at both ends with the bore S at the opposite faces of,the enlargedv head Qf of the valve Q), when said head rests on the seat U. Asthe head Q, approaches the seat Uand the pressure within the receiver still counterbalances the force of the spring V, air will passthrou-gh the port a to the rearward face-of the enlarged head Q of the valve Q and augment the force of the spring V to return the head-to the seat U. The

passage 0 also permits the escape of air entrapped hetween the outer ortion of the valve face Xandthe seat U,1nto'the uppermost portion of the bore S and thence through avent d to atmosphere. Direct leakage of fluid from the receiver through 'thepassage a is prevented, for the reason that when the headQ starts to move from the seat U, it immediately covers the innermost opening of the passage 0 and is designed to uncover the opening only when said valve is in its closed position..

I claim:

1. In a compressor comprising a storage receiver, and a compressing cylinder having a passage communicating with said cylinder and the storage receiver, a piston to reciprocate within the cylinder, a valve actuated by fluid under pressure within the storage receiver to open communication between the cylinder and atmosphere, a spring to return the valve to its normally closed position, means to augment the force of the spring to return the valve to its closed position, and an adjusting member to var the tension of the spring for attaining di erent pressures within the storage receiver.

2. In a compressor comprising a storage receiver, and a compressing cylinder having a passage communicating with said cylinder and the storage receiver, a piston to reciprocate withinthe cylinder, a valve actuated by fluid under pressure within the storage receiver to open communication betweenthe cylinder and atmosphere, a spring to return the valve to its normally closed osition and means to augment the force 0 the spring to return the valve to its closed position including a head for said valve, a cylinder for the head provided with a passage controlled by the valve head to connect opposite ends of the cylinder whereby opposite faces of the valve head are exposed to pressure fluid from the receiver.

In testimony whereof I have signed this specification.

LEWIS C. BAYLES. 

